Wavelength multiplexed matrix-matrix multiplier

Active Publication Date: 2019-04-30
FATHOM RADIANT PBC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008]Aspects of the present disclosure are directed towards parallel multiplication of a set of vectors using a spectral representation for the different vectors. The use of the spectral multiplexing with coherent fan-in allows the system to scale to a large number of independent vectors. The concurrent multiplication of many vectors by a matrix may be considered equivalent to a matrix-matrix multiply.
[0010]Spatial coherent input light allows the summations of each vector-matrix multiply within the matrix-matrix multiplication to efficiently collect light onto a narrow column of the output. This allows the system to have a large number of simultaneous wavelengths and output vectors.
[0015]For quick performance, matrix values may be obtained from a backplane with a local memory. Filtering may be accomplished with a space variant spectral filter, with a slit, or with an array of pinholes.

Problems solved by technology

This feature is a compelling reason to use optical processing since that parallelism is difficult to achieve otherwise.

Method used

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Embodiment Construction

[0023]FIG. 2 is a flow diagram showing the overall process of the present invention. The wavelength multiplexed matrix-matrix multiplier utilizes a spectrum of colors or wavelengths to turn an optical vector-matrix multiplier into a matrix-matrix multiplier. The system uses, for example, two 2-dimensional spatial light modulators to input the elements of a first and second matrix to be multiplied. The system uses space and spectral components to represent the rows and columns of the first matrix and it uses elements in two dimensions of space to represent the rows and columns of the second matrix. A coherent, broadband optical source is broadcast, spread by wavelength, and dispersed to the first spatial light modulator. The spectral components are dispersed to the spatial light modulator elements representing the rows of the first matrix and broadcast coherently to the spatial light modulator elements representing the columns of the first matrix. After modulation by the first spatia...

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Abstract

Optical systems for performing matrix-matrix multiplication in real time utilizing spatially coherent input light and wavelength multiplexing.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]The present invention relates to optical systems for real-time matrix-matrix multiplication. In particular, the present invention relates to wavelength multiplexed matrix-matrix multiplication systems using spatially coherent light sources.[0003]Discussion of Related Art[0004]In the 1970s P. N. Tamura and J. C. Wyant described optical systems for multiplying a matrix by a matrix in a series of steps (only vector-matrix multiplication in real-time is accomplished. To perform matrix-matrix multiplication, a mechanical system is necessary). FIGS. 1(a) and 1(b) (prior art) show an example from “Two-Dimensional Matrix Multiplication using Coherent Optical Techniques,” Optical Engineering, Vol. 18, No. 2, March-April 1979, pp. 198-204. FIG. 1(a) is a side isometric schematic drawing showing the optical elements of the system. FIG. 1(b) is a flow diagram showing the functions performed. A plane wave is focused to a line by a cyli...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06E1/04G06G7/16G02F3/02G06E3/00
CPCG06E1/045G06G7/16G06E3/008G02F3/02
Inventor ANDREGG, WILLIAMANDREGG, MICHAELWEVERKA, ROBERT T.CLERMONT, LIONEL
Owner FATHOM RADIANT PBC
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